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I just looked at an 85 harness that I have sitting in my garage.

You are trying to track down the source for the second wire that goes to the starter (ends with a black clip that clicks onto the connector on the starter). It should travel along inside the black plastic wiring loom/protecter that the main heavy-duty starter wire travels through. It doesn't go all the way to the battery positive terminal though. It comes out of the loom about a foot below the battery positive terminal and ends at a round white connector just below and in front of the rad fluid overflow bottle. From there, it must connect to the body wiring harness and travel back to the ignition so that when you turn the key to the start position, it gets power.
The round white connector has 5 pins, but only 4 are used. The wire you seek is the heaviest gauge one there. You can't mistake it for the others, as it is noticeably thicker.

This is all from an 85 harness, but I don't expect your 82 or 84 to be any different. In fact, I checked my 83, and it looks exactly the same.

Hope that helps you out some.

By the way, don't remove the intake manifold if you don't have to. It's a big PITA.
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